WASHINGTON — The U.S. government has announced a $3 million reward for information leading to the arrest of a man American authorities call one of the world's most prolific computer hackers.

Evgeniy Bogachev, who is believed to be in Russia, was indicted in Pittsburgh last year on charges including bank fraud and conspiracy. His picture has been plastered on "Wanted" signs distributed by the FBI.

Bogachev is accused of acting as ringleader for a massive hacking operation in Russia and Ukraine that installed malicious software on victims' computers to capture bank account numbers, passwords and other sensitive information.

Despite the reward, arresting overseas hackers is difficult for U.S. authorities, particularly in countries like Russia where there is no extradition treaty.

The Justice Department and State Department announced the reward Tuesday.